Many of us will run into this issue when trying to create a business intelligence site from out of box BI template, you may receive the following error.

An unexpected error has occurred.
Correlation ID:{bb8dc42a-14f0-*******}

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This typically means that you have not turned on the publishing feature at the site collection level. So all you got to do to get around this problem is simply go to Site Action-> Site Settings –> Site Collection Administration –> Site Collection Features and click on activate button next to SharePoint Server Publishing Infrastructure. Thats it..

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